- Improved scheduling performance when many nodes, and prefilter returns 1-2 nodes (e.g. daemonset)
  

  
  Action required for custom scheduler plugin developers:
  Plugins **have to** implement a QueueingHint for Pod/Update event if the rejection from them could be resolved by updating unscheduled Pods themselves.

### API Change

- **ACTION REQUIRED** for custom scheduler plugin developers:
  `PodEligibleToPreemptOthers` in the `preemption` interface now includes `ctx` in the parameters.

      * Added exported env vars to kubectl plugins so that plugin developers have access to global flags, namespace, the plugin descriptor and the full path to the caller binary.

  * Enhancement

  
  Type `Parallelizer` in `k/k/pkg/scheduler/framework/parallelism` has been split into interface `Parallelizer` (in `k8s.io/kube-scheduler/framework`) and `struct Parallelizer` (location unchanged in k/k). Plugin developers should update the import path to staging repo. ([#133172](https://github.com/kubernetes/kubernetes/pull/133172), [@ania-borowiec](https://github.com/ania-borowiec)) [SIG Node, Release, Scheduling, Storage and Testing]

 - Scheduler's CycleState now embeds internal read/write locking inside its `Read()` and `Write()` functions. Meanwhile, `Lock()` and `Unlock()` function are removed. Scheduler plugin developers are now required to remove `CycleState#Lock()` and `CycleState#Unlock()`. Just simply use `Read()` and `Write()` as they're natively thread-safe now. ([#101542](https://github.com/kubernetes/kubernetes/pull/101542), [@Huang-Wei](https://github.com/Huang-Wei))...

containers](https://kubernetes.io/docs/concepts/workloads/pods/ephemeral-containers/), it became more obvious how we can support developers with tooling built on top of `kubectl exec`. The addition of the `kubectl debug` [command](https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/1441-kubectl-debug/README.md) (it is alpha but your feedback is more than welcome), allows developers to easily debug their Pods inside the cluster. We think this addition is invaluable.  This command allows one to create...

## Changelog since v1.28.10

## Changes by Kind

### API Change

- Improved scheduling performance when many nodes, and prefilter returns 1-2 nodes (e.g. daemonset)
  

 - Renamed `UpdatePodTolerations` action type to `UpdatePodToleration`.
  Action required for custom plugin developers to update their code to follow the rename. ([#129023](https://github.com/kubernetes/kubernetes/pull/129023), [@zhifei92](https://github.com/zhifei92)) [SIG Scheduling and Testing]
 
## Changes by Kind

### Deprecation

- For scheduler plugin developers: the scheduler framework's shared PodInformer is now initialized with empty indexers. This enables scheduler plugins to add their extra indexers. Note that only non-conflict indexers are allowed to be added. ([#110663](https://github.com/kubern...